Anthony, Gardner Chace, 1856- (from old catalog), Ashley, George Francis, (from old catalog) joint author · Boston, D. C. Heath & co. · leaf 136
and the surface generated will be aright helicoid. This type is illustrated by thesquare-threaded screw (Fig. 146, page 69). 154. If the generatrix does not intersectthe axis, as in the preceding cases, a moregeneral type will be generated, as shown inFig. 193. In this case the generatrix is… … Fig. 191 Fig. 192. Fig. 193, 120 DESCRIPTIVE GEOMETRY In Fig. 194 conceive the generatrix cd asmaking the constant angle c^cth with a hori-zontal plane, and revolving about a verticalaxis through o. Point e will describe the circleof the upper base cgl, point d will describe thecircle of the lower…
Geometry, Descriptive
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